Daniel f



(No Model.)

D. F. DUNN.

MACHINE FOR TRUING VALVE PLUGS, SEATS, &c. No. 378,196. Patented Feb.21, 1888.

WITNESSES: INVENTOR: I

ATTORNEYS.

' UhllTED "Sierras PATENT @trrc DANIEL F. DUNN, OF COLUMBUS, OHIO,ASSIGNOR OF ONE-HALF TO JOHN S. ELLIS, OF SAME PLACE.

MACHINE FOR TRUSNG VALVE PLUGS, SEATS, 8L0.

.SPBCIFICATION forming part of Letters Patent No. 378,195, datedFebruary 21, 1883.

Application filed October 15, 1887.

To all whom it may concern:

Be it known that I, DANIEL F. DUNN, of Columbus, in the county ofFranklin and State of Ohio, have invented a new and Improved Machine forTrning Valve Plugs, Seats, &c.,

of which the following is a full, clear, and exact description.

The present invention relates to a device for centering a valve-stem orvalve-casing, 810., and means for grinding or burring the plug or seatof the socentered valve stem or casing; and it consists in the formationand combination of the parts for operation, all substantially as willhereinafter more fully appear, and be :5 pointed out in the claims,

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a side view of the clamping and centering mechanism, showingthe position of a valvestem when centered and clamped therein and theburring or grinding imple ment combined therewith. Fig. 2 is an end viewof the clamp-arms and clamp-jaws and of a barring head, and Fig. 3 is aview of the burr-shaft crank detached.

At and upon the end of astationary tubular spindle, A, suitablysupported or held and exteriorly screw-threaded, are formed ear-pieces au, to which are pivotally hung the ends 5 of clamp'arms B, having inwardbends near their outer ends, as at c, to the ends of which, by their carpieces (1, are pi votally hung clamping'jaws C, the inner edges, f, ofwhich are made of concave or other suitable form for an embrace or holdof said jaws upon the valve, stem, the, said clamparms 13 having lugs Doutside of their pivotal connections with the tubular spindle, to whichare pivoted the outer ends of links E, their inner ends being pivoted toearpiecesq, formed upon asleeve, F, fitting loosely upon thescrew-threaded tubular spindle A, to the rear of which sliding sleeve,e11- gaging with the screw-threads of the spindle, is a nut, G.

lVithin the tubular spindle A, and having a rotatable and slidingbearing therein, is a shaft, H, at the outer end provided with a squaredportion, h, formed thereon to receive the socket 7a of a crank-handle,K, its other end project- (No modeLl ing beyond thcinncr end ofspindleA,and there provided with an enlargement, L, having therein an axialopening,M, ofconicahconoidal,

or funnel shape, as indicated at 'HL, and of a shape corresponding withthat of the end of a valve-plug, said opening M having its surfacehurred, milled, roughened, or otherwise prepared for cutting orgrinding. A valve'plug,

N, to be trned is first centered by its stem N within the clamp-jaws Cbythe turning of the screw-nut G on the threaded spindle A against thesleeve F, forcing it inwardly, and through the links E forcing theclamp-arms B forward, they swinging upon their pivots at a on the 55 endof said fixed spindle, their enner ends, 0, being carried inwardlytoward the axial line of the said spindle and upon the valve-stem, thepivoted clamp-jaws G insuring an adjustment and parallel bearing uponsaid stem. Then upon attaching the crank-arm A onto the end ofburr-shaft H, forcing said shaft inwardly for its conical burred openingto lie upon and around the end and edge of the valve-plug, and rotatingsaid shaft, a cutting or grinding of said valve-plug is securedperfeet-1y true and concentric with the axial line of its stern, and allin a most simple, easy, and practical manner, it being observed that thejaws are capable of such a spread from each other as to permit thepassage of the burringshaft between them for its withdrawal from thetubular bearing-socket A, enabling the substitutions of burr-shaftshaving heads with barring or grinding surfaces of different charentersor forms suitable for use upon other articles clamped by said jaws OCas, for instance,

a valve casing or body may he clamped and centered with the axial lineof its seat coincident with the axial line of shaft H, which is 0provided with a conical-shaped head having exterior burr or grindingsurface.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. The combination, with a tubular spindlehaving clamp-arms pivoted thereto, of a sliding sleeve fitting uponthcspindle and links connecting said clamp-arms and sleeve, substantially as and for the purpose described.

2. The combination, with a screw-threaded tubular spindle havingclamp-arms pivoted thereto, of a sliding sleeve fitting upon thespindle, links connecting said clamp-arms and sleeve, and screw-nut G,substantially as and for the purpose described.

3. The combination, with a tubular spindle having clamp-arms pivotedthereto provided with pivoted clamp-jaws G, of a sliding sleeve fittingupon the spindle and links connecting said clamp-arms and sleeve,substantially as and for the purpose described.

4. The combination, with a screw-threaded tubular spindle havingclamp-arms pivoted thereto provided with pivoted clamp-jaws, of asliding sleeve fitting upon the spindle, links connecting saidclamp-arms and sleeve, and screw-nut G, substantially as and for thepurpose described.

' 5. The combination, with a tubular spindle having clamp-arms pivotedthereto, a sliding sleeve fitting upon the spindle, and links connectingsaid clamp-arms and sleeve, of a shaft having rotatable and slidingbearing in said sleeve, provided with a burring or grinding head,substantially as and for the purpose described.

6. The combination, with a tubular spindle having clamparms pivotedthereto, a sliding sleeve fitting upon the spindle, and links conmeetingsaid clamp-arms and sleeve, ofa shaft having rotatable and slidingbearing in said 0 sleeve,provided with a funnel-shaped opening, M, withburring or grinding surface, substantially as and for the purposedescribed.

7. The combination, with a'screw-threaded tubular spindle havingclamp-arms pivoted 5 thereto, a sliding sleeve fitting upon the spindle,links connecting said clamp -arms and sleeve, and screw-nut, of a shafthaving rotatable and sliding bearing in said spindle, pro vided with aburring or grinding head, sub 0 stantially as and for the purposedescribed.

'8. The combination, with a screw-threaded tubular spindle, A, havingclamp-arms B B pivoted thereto, provided with pivoted clampjaws O G, asliding sleeve, F, fitting upon the 5 spindle, links E E, connectingsaid clamp-arms and sleeve, and screw-nut G, of a shaft, H, havingenlargement L, with funnel shaped opening M, with burring or grindingsurface, and provided with crank-handle K, all sub- 50 stantially asshown and described, for the purpose specified.

DANIEL F. DUNN.

\Vitnesses:

J. WV. FRIESTONE, O. O. \VILLIAMs.

